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재생첨가제를 사용한 재생아스팔트의 물리적특성에 관한 실험적 연구
최상필,권혁준,김정환,박승범,조청휘 忠南大學校 産業技術硏究所 1999 산업기술연구논문집 Vol.14 No.1
This paper persent the results of an exprimental study on the mechanical properties of recycling agents. This study has been performed to obtain the properties of recovered asphalt such as penetration, softening point and penetraion, ductility after thin film oven test. In all testing , the result is equivalent and similar to virgin asphlt, but in the case of low penetration ductility after thin film oven test shows that functional amount of recycling agent is limited in some degree according to adding recycling agent is limited in some degree according to adding recycling agent.
리튬 폴리머 배터리용 급속 충 방전 시스템의 설계 및 특성 연구
반충환(Choong-Hwan Ban),권완성(Wan-Sung Kown),이영진(Young-Jin Lee),한동화(Dong-Hwa Han),은종목(Jong-Mok Eun),최규하(Gyu-Ha Choe) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
본 논문에서는 Ni-Cd, Ni-MH에 비해 전압과 온도특성, 에너지저장 밀도가 높으며 리튬 이온배터리에 비해 누액과 폭발의 위험성이 없는 리튬폴리머 배터리를 사용하여 급속 충 방전 시스템의 설계와 배터리 온도 특성을 연구하였다. 급속 충 방전 시스템은 3상 PWM 컨버터와 강압 컨버터(풀브릿지 컨버터)를 이용하여 CC/CV(정전류/정전압) 제어를 통하여 급속 충 방전 시스템을 설계 하였으며, 이로 배터리의 충방전 특성을 실험으로 입증하였다.
관동맥이 완전폐쇄된 환자에서 측부순환과 99mTc - MIBI 심근 SPECT 소견 비교
손경환(Kyung Hwan Son),김권삼(Kown Sam Kim),이무열(Moo Yel Lee),이원호(Won Ho Lee),김덕윤(Deog Yoon Kim),강흥선(Heung Sun Kang),조정휘(Chung Whee Choe),김명식(Myung Sik Kim),송정상(Jung Sang Song),배종화(Jong Hwa Bae) 대한내과학회 1997 대한내과학회지 Vol.53 No.1
N/A Objectives: The role of coronary collateral circulation in protecting myocardium after the occlusion of a supplying artery has long been debated. Recent date show that the coronary collateral circulation may partially prevent ischemia and preserve myocardial contractile function. The purpose of this study was to evaluate the relation between the grades of collateral circulation and perfusion scores of 99mTc-Heart SPECT in patients with totally coronary occlusion. Methods: We studied 44 patients with totally coronary occlusion who had been hospitalized at Kyung Hee University hospital between October, 1989 and May, 1994, Patients were classified into two groups; Group 1: patients with angina pectoris (n=21), Group 2: patients with myocardial infarction (n=23). Angiographic collateral circulation was graded from 0 to 3: 0=none, 1=filling of side branch only, 2=partial filling of the epicardial segment, 3=complete filling of epicardial segment. The perfusion score of dipyridamole stress 99mTc-MIBI Heart SPCET was analyzed with angiographic findings. Resting and stress echocardiography were analyzed to identify left ventricular wall motion abnormalities. Results: 1) When LAD was totally occluded, there were hishevcrgree of collateral circulations from RCA in group 1 and group 2. When RCA was totally occluded, there was higherdesree of collateral circulation from LAD in group 1 and group 2. 2) The degree of collateral development was higher in group 1 than in group 2 (2.5±0.7 vs. 1.8±1.0, p<0.05). 3) In 99mTc-MIBI Heart SPECT, there was no significant difference of perfusion score at stress but perfusion score was significantly higher in group I than in group 2 at rest. 4) In 99mTc-MIBI Heart SPCET, there was no difference of perfusion score between totally coronary occlusion territories in group 1 and more than 50% coronary artery stenotic territories in group 1 and group 2. 5) In stress echocardiography, ten of the 13 patients showed normal LV wall motion at rest, but 9 of these 10 patients showed LV wall motion abnormalities at stress in group l. In group 2, all 10 patients showed LV wall motion abnormalities at rest and 3 of these patients showed more aggravation of LV wall motion abnormalities. Conclusion: Collateral circulation in angina patients can prevent myocardial ischemia and preserve myocardial function at rest, but not at exercise. Collateral circulation in patients with myocardial infarction cannot preserve myocardial function at rest. and exercise. Dipyridamole stress 99mTc-MIBI Heart SPECT is one of the indirect quantification methods to evaluate collateral development and coronary flow reserve.
형질전환 효율성 향상을 위한 국화 최적 품종 선발 및 배지・배양조건설정
강찬호,Seung Jung Yun,한범수,So Gon Han,Sung Hwan Kown,Young Ju Song,Mi Hyang Jang 한국식물생명공학회 2009 식물생명공학회지 Vol.36 No.4
To set efficient transformation system in chrysanthemum, thirty-four chrysanthemum (Dendranthema grandiflorum Kitamura) varieties were collected and cultured for shoot regeneration. Five varieties, ‘Shuho-no-chikara’, ‘Zinba’, ‘Baekma’, ‘Pink pride’ and ‘Keumsu’ of them were selected, because they had a high shoot regeneration efficiency. MS medium containing 1.0 mg/L NAA and BA respectively was very adequate for shoot regeneration in those varieties. MS medium with 3.0 mg/L NAA and 1.0 mg/L kinetin in ‘Shuho-no-chikara’ and the medium with 0.5 mg/L NAA and 3.0 mg/L BA in ‘Keumsu’ were also suitable for shoot regeneration. The most efficient callus induction and shoot regeneration were obtained on MS medium. Shoot regeneration was enhanced more than 8% on MS medium with 0.3% phytagel and 10-15 mg/L putrescine. The best cultural material for shoot regeneration was stem. When stem was used as a culture material, shoot regeneration rate was increased more than 26% and the days to shoot regeneration was shortened about 14 days. 국화에 있어서 효율적 형질전환 체계를 구축하기 위하 여 국내외에서 육종되고 시장지배력이 강한 34개의 품종 을 수집하고 이 중 우수한 신초생성 능력을 가진 5개 품 종인 수방력, 백마, 신마, 핑크프라이드, 금수 등을 선발 하였다. 이들 품종에 적합한 생장조절제를 선발한 결과 5개 품종에 공통으로 적용할 수 있는 생장조절제 처리는 1.0 mg/L NAA와 1.0 mg/L BA의 혼용처리 이었으며 수방 력에는 3.0 mg/L NAA와 1.0 mg/L kinetin 처리가, 금수에 는 0.5 mg/L NAA와 3.0 mg/L BA 처리가 역시 효율적으로 적용되었다. 캘러스 유도와 재분화 능력을 종합적으로 검토한 결과 기본배지는 MS, 배지응고제는 phytagel 0.3% 그리고 폴리아민인 putrescine을 10-15 mg/L로 처리할 경 우 재분화율이 8% 정도 향상되었으며 배양재료로 줄기 를 사용할 경우 기관분화율이 26% 정도 향상되었으며 기관분화 소요일수도 14일 단축시킬 수 있었다